Features 1,[Efficient and Timesaving]: Our guitar string winder is designed to make the process of replacing strings quick and easy. With a highspeed motor that operates at 180rpm, you can swiftly wind or unwind your guitar strings in no time. 2,[Versatile and Convenient]: This automatic guitar tuner is suitable for both guitars and ukuleles, making it a versatile tool for musicians of all levels. Its compact and lightweight design allows for easy portability, so you can take it with you wherever you go. 3,[Userfriendly Features]: Say goodbye to string winding confusion with our considerate design. The grippable body ensures a comfortable and tight grip, ensuring smooth winding and unwinding. Additionally, our longlasting rechargeable battery provides hours of usage time, and can be conveniently charged through the mini USB charging port. 4,[Adjustable Speed Gears]: Our guitar string winder tool features two adjustable gears, allowing you to control the winding speed according to your preference. The first gear operates at 130rpm, while the second gear provides a faster winding speed of 180rpm. 5,[Reliable and Sturdy]: With a powerful motor and a sturdy construction, our automatic guitar winder is built to last. The battery capacity of 1000mA ensures a reliable performance, while the USB C charging port offers convenience for charging. Invest in this reliable and durable guitar tuner winder to enhance your playing experience. Specification Battery Capactiy: 1000mA Charging Time: 2hr Usage Time: 3hr Charging Port: USB C Type .Number of Gears: 2 Adjustable Gears 1st Gear: Winding Speed is 130 rpm 2nd Gear: Winding Speed is 180 rpm Product Color: Black, White (optional) Product Size: 6 x 2.5 x 10cm or 2.4 x 1 x 3.9inch Storage Bag Size: 8 x 12 x 4.5cm or 3.1 x 4.7 x 1.8inch   Package List 1 x Guitar String Winderbr or 1 x Charging Cablebr or 1 x Storage Bagbr or 1 x Instruction Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.